Intermediate chuck-jaw.



A. R. McKlNNEY.

INTERMEDIATE CHUCK JAW.

APPLICATION FILED 020.24.1914.

CULUMBIA PLANOGRAPH IO-,WASNINGTON, D. c.

H 1mm Patented Nov. 23, 1915.

ALBERT R. MCKINNEY, 0F BRISTOL, VIRGINIA.

INTERMEDIATE CHUCK-J AW.

Specification of Letters Patent.

Patented Nov. 23, 1915.

Application filed December 24, 1914. Serial No. 878,895.

To all whom it may concern Be it known that I, ALBERT R. MCKIN- NEY, acitizen of the United States of America, residing at Bristol, in thecounty of Washington and State of Virginia, have invented certain newand useful Improvements in Intermediate Chuck-Jaws, of which thefollowing is a specification, reference being had therein to theaccompanying drawing.

This invention relates to an intermediate chuck jaw and has for itsobject the production of a. simple and eliicient adjustable intermediatechuck jaw which will enable an operator to secure a shallow step uponwhich to place-the back face of the work upon which he is working. Thiswill permit the work when chucked and faced on the front side thereof tohave a uniform thickness throughout.

A still further object of this invention is the production of a simpleand eflicient adjustable jaw which may be applied to the chuck jaws nowin use.

With these and other objects in view this invention consists of certainnovel combinations, constructions, and arrangements of parts as will behereinafter fully described and claimed.

In the accompanying drawings :-Figure -l is a side elevation of thedevice applied to a chuck head mounted upon the head stock of a lathe.Fig. 2 is a front elevation of the chuck head showing the device appliedthereto. Fig. 3 is a side elevation of the chuck head showing theintermediate chuck jaw arranged in a dilferent position from that shownin Fig. 1. Fig. 4 is a detail perspective of the intermediate chuck jawplate.

By referring to the drawings it will be seen that 1 designates the headstock of the lathe which carries the chuck 2. A plurality of chuck jaws3 are adj ustably mounted upon the chuck 2 in the usual manner, and eachof these chuck jaws carries a threaded pin or screw 4, which screw 4 isadapted to work in the longitudinally extending slot 5 of the adjustablechuck jaw plate 6. This slot 5 is provided with an enlarged circularopening 7 at the rear end thereof for the purpose of facilitating thefitting of the plate 6 over the head of the screw or pin 4. The plate 6is provided with an elongated front tongue 8 and an intermediate stepportion 9, and also an upper front step portion 10. The plate is alsoprovided with a lower rear step portion 11, and an upper An upwardlyextending tongue 13 is formed intermediate the front and rear stepportions as illustrated in Fig. 4.

As illustrated in Figs. 1 and 3 it will be seen that the intermediatechuck plate 6 is capable of being adjustedin a desired position withrespect to the chuck jaws 3, the step portions formed upon the plate 6being arranged at a different height with respect to the step portionsformed upon the chuck jaws 3, or in other words approximately one-halfthe distance of the height of the chuck jaws 3. This structure isclearly illustrated in Figs. 1 and 3.

It should be understood that the present device is especially adapted tobe used for supporting shallow disks, rings and the like, such asillustrated in dotted lines and indicated by the numeral 14 in thedrawings, and it should be understood that the edge of the ring isadapted to rest against the shoulders 15 of the chuck jaws 3, the backface of the disk 14 being adapted torest upon the upper face of one ofthe step portions 8, 9, 10, 11 or 12 for the purpose of supporting theshallow disk or ring 14 in the desired position in order that a uniformthickness may be produced upon the ring when the outer or front face hasbeen dressed.

Having thus described the invention what is claimed as new, is

1. As a new article of manufacture, an adjustable chuck jaw platecomprising an elongated body, said body provided with an elongated slotextending longitudinally thereof terminating in an enlarged circularpocket at one end thereof, said slot adapted to receive a securing meansfor attaching said intermediate chuck jaw plate-to a support, and saidintermediate chuck jaw plate provided with a plurality of forward andrear intermediate step portions for facilitating the supporting of ashallow disk upon a chuck head when said intermediate chuck jaw plate isapplied to an adjustable chuck jaw carried by a chuck head.

2. In a device of the class described, the combination with a chuckhead, a plurality of adjustable chuck jaws carried thereby, of anintermediate chuck jaw plate carried by each chuck jaw, each plateprovided with an elongated longitudinally extending slot, a threaded pinpassing through said slot for rear step portion 12.

holding said chuck jaw plate "in an adjusted position, each chuck jawplate provided with a plurality of step portions formed-thereon, eachchuck jaw provided with a plurality of step portions formed thereon, andthe corre-.

portions, of an intermediate adjustable chuck jaw plate secured to theside of said chuck jaw and provided with intermediate step portionsthereon, whereby said intermediate chuck jaw plate may support a pieceof work in an intermediate position with respect to said chuck jaw.

4. In combination with a chuck jaw, of an adjustable chuck jaw platecomprising a flat body, said chuck jaw provided with step portionsformed thereon, said adjustable chuck jaw plate provided with aplurality of intermediate step portions formed thereon arranged atintermediate heights with respect to the step portions of Said chuckjawfor facilitating the supporting of a piece of work in an intermediateposition with respect to the step portions of said chuck jaw.

5. In combination with a chuck jaw, of an adjustable chuck jaw platecomprising an elongated. flat, body provided with a plurality ofintermediate step portions formed upon the outer face thereof, saidchuck jaw provided with a plurality of step portions formed upon theouter face thereof, the step portions of said adjustable chuck jaw platebeing formed at an intermediate point with respect to the step portionsof said chuck jaw, and means for facilitating the locking of saidadjustable chuck jaw plate in a set position with respect to said chuckjaw.

' In testimony whereof I hereunto aiiix my signature in presence of twowitnesses.

ALBERT R. MOKINNEY. Witnesses:

J. G. TILLEY, JAMES L. DAVIS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

